Making the Supernova II vocoder work.

Ensure that the correct input is set up with enough gain if a
microphone is used as the modulator source. Call up one of the vocoder
presets (OS2 program H124, OS1.5 program D124). Set the vocoder balance
to be value 063 "vocoder only". Either activate the constant gate or
play notes on the Supernova II at the same time as talking or singing
into the microphone. The vocoded output should be audible. If the
modulator signal can still be heard over the top of the vocoded output
this is due to the amount of sibilance that has been added. The
sibilance can be extracted by high pass filtering the modulator source
or by synthesising noise. Either set the sibilance type to noise or
reduce the sibilance level to reduce the audibility of the modulator
signal.